87178291241 has 2 divisors, whose sum is σ = 87178291242. Its totient is φ = 87178291240.

The previous prime is 87178291219. The next prime is 87178291271. The reversal of 87178291241 is 14219287178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86644866025 + 533425216 = 294355^2 + 23096^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87178291241 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87178291241.

It is not a weakly prime, because it can be changed into another prime (87178291271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43589145620 + 43589145621.

It is an arithmetic number, because the mean of its divisors is an integer number (43589145621).

Almost surely, 2^87178291241 is an apocalyptic number.

It is an amenable number.

87178291241 is a deficient number, since it is larger than the sum of its proper divisors (1).

87178291241 is an equidigital number, since it uses as much as digits as its factorization.

87178291241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 50.

The spelling of 87178291241 in words is "eighty-seven billion, one hundred seventy-eight million, two hundred ninety-one thousand, two hundred forty-one".